I have synthesized AuNPs using different HAuCl3.xH2O (0.4 mM, 0.8 mM, 1.2 mM, 1.6 mM, 2.0 mM, 2.4 mM, 2.8 mM, and 3.2 mM) of different sizes.
It was observed that when the concentration of the HAuCl3.xH2O increased the value of d-spacing increased. Can anyone please tell me the exact reason behind this?
The values of d-spacing observed were as follow:
0.4 mM=0.20 nm
0.8mM=0.22 nm
1.2 mM=0.23 nm
1.6 mM=0.26 nm
2.0 mM=0.34 nm
2.4 mM=0.44 nm
2.8 mM=0.52 nm
3.2 mM=0.63 nm
This question is very confusing. How was the 'd-spacing' obtained? More details of what you are actually doing would be helpful. The radius of a single gold atom is around 174 pm (= 0.17 nm) - the values you quote are in the same league.
Thank you so much Alan F Rawle sir...
Sir the value of d-spacing were obtained while fringe width observation through HR-TEM imaging.
I would look at the chloride content with ESCA/XPS. The use of chloride precursors leaves an intractable chloride residue. I've seen this before with Au and PdAu catalysts. It may be that increasing the chloride in the precursor extends the lattice somewhat. It's an interesting trend if there is no other artifact.
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